Harley Pasternak's 25-Minute At-Home Fitness Prescription

The celebrity trainer reveals a quick fat-burning workout routine

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Don't let that chilly walk to the gym (or the price of a gym membership) be your excuse for not working out this month. Here's how you can get in shape without leaving your pad.

STEP 1: 5-Minute Cardio Warm-Up
"If you live in a house, try speed walking or jogging around the block. If you live in an apartment, try going up and down the stairs. You can also do jumping jacks, jump rope, or pretend you're jumping rope."

STEP 2: Lunges
"Step forward as if you're proposing marriage and drop your back knee down so you create a 90-degree angle between your leading knee and trailing knee. Then return to standing. Do 20 repetitions on each side. If you want to make it more difficult, hold dumbbells at your side as you do the exercise. Weights can range up to 10 pounds each. If you don't own traditional dumbbells, you can also use soup cans or bottles of water."Works: Thighs, quads, butt

STEP 3: Dumbbell Flies
"Lie flat on the ground, holding the dumbbells toward the ceiling with your arms extended, then open your arms up and close them again like you're hugging a barrel. Do 20 reps."Works: Chest, shoulders

STEP 4: Double Crunches
"Keep lying with your back on the ground and with your knees bent. You want to crunch your body double, which means bringing your chest up toward your knees and your knees into your chest. Do 20 reps."Works: Abs